Orientation Dependence of the Thermal Expansion Coefficients of Iron Borate FeBo3 Crystals

We present high-resolution X-ray diffraction measurements of the lattice parameters of iron borate FeBO3. These measurements were performed at room temperature and at various temperatures ranging from 400 up to 600∘C, enabling the determination of the coefficients of thermal expansion (CTE). The three-dimensional (3D) indicatory surface of thermal expansion of FeBO3was constructed in MathCad. It is shown that the orientation dependence of CTE in FeBO3 is spheroid elongated on threefold axis

INVESTIGATION OF THE INFLUENCE OF TEMPERATURE ON THE CRYSTALLITE SIZE OF IRON BORATE

By X-ray peak profile analysis, the crystallite size was estimated from Scherrer’s formula. We have also investigated the temperature dependence of crystallite size in FeBO3

INVESTIGATION OF THE THERMAL EXPANSION OF IRON BORATE NEAR THE NEEL POINT

The lattice parameters of FeBO3 were investigated by x-ray diffraction in the temperature range 18–300˚C. It is shown that the iron borate has the anomalous thermal expansion along its principal crystallographic axis «c» in the temperature region of the anti-ferromagnetic transition (the Neel point TN = 77˚C).Измерения выполнены в ЦКП «Урал-М» в ИМЕТ УрО РАН

Orientation Dependence of the Thermal Expansion Coefficients of Iron Borate FeBo3 Crystals

We present high-resolution X-ray diffraction measurements of the lattice parameters of iron borate FeBO3. These measurements were performed at room temperature and at various temperatures ranging from 400 up to 600∘C, enabling the determination of the coefficients of thermal expansion (CTE). The three-dimensional (3D) indicatorysurface of thermal expansion of FeBO3was constructed in MathCad. It is shown that the orientation dependence of CTE in FeBO3 is spheroid elongated on threefold axis